The "Math Horizon" image shows the projection of a sphere in fourspace that has a single point of selfintersection at the center of the image. Bands on the surface are removed to help see the structure of the projection. Here, the image is being rotated in threespace around a vertical axis.


The "Math Horizon" image shows the projection of a sphere in fourspace that has a single point of selfintersection at the center of the image. Bands on the surface are removed to help see the structure of the projection. Here, the image is being rotated in threespace around a horizontal axis.



